After ovulation question...

Hi everyone,
​My last cycle was 54 days. We have been trying for about 7 months - I went off the pill then after years. since then I have had 3 periods in 7 months. 
​This month I started ovulation tests at cd6 as I didn't want to miss it - I ovulated on cd19. For the last day or so I have been feeling cramps - a sort of tugging very often. 
​Anyone have any insight? I don't normally have this after ovulation